Not from Wyoming, but this seems like a classic disagreement between the average state resident (or rather, the industry that has purchased her legislator) and some exceptional municipality. Since it's Wyoming I'm guessing Jackson Hole. Probably they wanted to have something nice to brag about to coastal rich people conflicted about vacationing in a red state, so they were going to require local ratepayers to purchase some percentage of "clean" energy. Outlawing this sort of local arrangement is just the sort of thing that state governments do. We've seen a lot of state laws outlawing public internet service, for example.
They might also have assumed that I approve of states interfering with municipalities this way. No way: I'm for complete decentralization. Of course that means I'm also against municipalities decreeing that one type of power will be available rather than another, but I figure people can work at a local level or vote with their feet rather than enlisting state or federal interference.
